The invention relates to a magnetic gel injection molding method of large-scale rare-earth sinter magnet, wherein it comprises: dissolving ethyl acrylate into toluene to be the pre-mixed solution at 5-50vol.%; adding disperse agent into the pre-mixed solution to be mixed with magnetic powder in Ar condition inside vacuum operation box; grinding the mixture material for 2-24hours; adding initiator, defoaming the slurry room for 5-30mins; pouring slurry into mould; heating mould to 40-80Deg. C; heeping the temperature of magnetic field for 30-150mins; demoulding; vacuum drying, to obtain the rare-earth magnetic blank; vacuum sintering the blank, thermally treating to obtain the rare-earth sintered magnet. The invention has the advantages that: it can improve the magnetic directed degree to obtain high magnetic property, with simple operation and lower cost. |